An editor at Sky & Telescope (S&T) magazine since 1974, Dennis di Cicco brings to that far-ranging task a background in mechanical engineering and experience as a telescope maker, astrophotographer, and observer dating back to the early 1960s. He is particularly proud of his role in creating S&T's popular columns Test Reports and Gallery. He has led expeditions to observe solar eclipses around the globe and held astrophotography workshops in Australia's Outback. His photography, which is well known to S&T's readers, has appeared in hundreds of books and magazines and includes the award-winning, year-long photograph of the Sun's analemma made in the late 1970s.

Di Cicco started working with astronomical CCDs in 1990, and did pioneering work in CCD tricolor imaging. He was the principal force behind the creation of Sky Publishing's quarterly CCD Astronomy.

Di Cicco has discovered many asteroids from his backyard observatory in Sudbury, Massachusetts. Although the asteroid hunt covered a brief period in the mid-1990s, its success led to the observatory's ranking among the world’s top 100 discovery sites. In 1989 the International Astronomical Union honored him with the naming asteroid 3841 Dicicco.